Energy Levels and Photon Emission

Mr. Fullerton introduces energy level diagrams, focusing on hydrogen and mercury atoms. He explains how electrons transition between energy levels, absorbing or emitting photons. The video includes sample problems on calculating photon energy and frequency, and discusses ionization and kinetic energy in mercury atoms.

What is the primary purpose of energy level diagrams?

• To measure the temperature of an atom

• To visualize the allowed electron energy levels in an atom

• To calculate the mass of an atom

• To determine the color of light emitted by an atom

In a hydrogen atom, what is the energy level called where the electron is most tightly bound?

• Free state

• Ionized state

• Ground state

• Excited state

How much energy must a hydrogen electron absorb to move from the ground state to be free?

• 3.4 electron volts

• 13.6 electron volts

• 10.2 electron volts

• 1.89 electron volts

What is the energy of a photon emitted when an electron in hydrogen drops from n=3 to n=2?

• 1.89 electron volts

• 10.2 electron volts

• 3.4 electron volts

• 13.6 electron volts

What is the frequency of a photon emitted when an electron in hydrogen drops from n=2 to n=1?

• 2.46 * 10^15 Hz

• 1.89 * 10^15 Hz

• 3.4 * 10^15 Hz

• 10.2 * 10^15 Hz

What is the first step in calculating the frequency of an emitted photon?

• Calculate the mass of the electron

• Measure the wavelength of the photon

• Convert energy from electron volts to joules

• Determine the speed of light

In mercury, what are the energy levels labeled as?

• Letters (a, b, c, etc.)

• Numbers (n=1, n=2, etc.)

• Greek letters (alpha, beta, gamma, etc.)

• Roman numerals (I, II, III, etc.)

What is the energy of a photon emitted when an electron in mercury drops from level F to level C?

• 2.84 electron volts

• 5.52 electron volts

• 10.38 electron volts

• 1.89 electron volts

How much kinetic energy does an electron have after absorbing 20 electron volts in mercury?

• 9.62 electron volts

• 10.38 electron volts

• 20 electron volts

• 5.52 electron volts

What happens to the extra energy when an electron is ionized?

• It becomes the kinetic energy of the emitted electron

• It is absorbed by the nucleus

• It is lost as heat

• It is converted into mass